Map、Set、Iterator迭代详解与Java平台的集合框架

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Map
、Set
、Iterator
迭代详解与Java
平台的集合框架
Map
、Set
、Iterator
迭代详解
Map
接口定义了四种类型的方法，每个Map
都包含这些方法。
equals(Object o)
比较指定对象与此Map
的等价性。
hashCode()
返回此Map
的哈希码。
Map
定义了几个用于插放和删除元素的变换方法。
remove(Object key)
从Map
中删除键和关联的值。
put(object key,Object
value)
将指定值与指定键相关